Air Brake Test Ontario pdf

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6 - Air Brake Test

Practice Test - 6

30 Questions

Passing Marks - 80%

1 / 30

What is the primary purpose of air brake systems on large commercial vehicles?

To improve fuel efficiency

To enhance steering control

To reduce vehicle weight

To provide high braking forces over long distances

2 / 30

A tractor protection valve:

Causes the trailer service brakes to apply in an emergency

Prevents air loss from the trailer supply line

Prevents loss of air out of the towing vehicle

Causes towing vehicle spring brakes to apply in an emergency

3 / 30

Driving a vehicle with an air brake system that is outside the normal operating pressure range is:

Safe at only high speed

Not safe at any time

Unsafe only when going down a hill

Safe only for a short period of time

4 / 30

To check the air pressure in a vehicle's air brake system, a driver:

Reads the gauges on the instrument panel

Operates the engine at fast idle

Waits for the governor cut-out

Makes a full brake application

5 / 30

An air tank drain valve that fails to function:

Indicates a defective brake pedal

Is a defect of the air brake system

Indicates a defective air compressor governor

Is a normal condition of the air brake system

6 / 30

To prevent vehicle movement during an inspection of the air brake system, a driver should use:

The service brakes

The brake pedals

Wheel chocks and blocks

The spring brakes

7 / 30

What should be used to prevent vehicle movement during an air brake inspection?

Wheel chocks or blocks

Trailer brakes

Parking brake

Spring brake

8 / 30

Manually-operated front wheel limiting valves are:

Used to limit the number of times that brakes can be applied

Only found on new vehicles to disable front steering axle brakes

Used to reduce the brakes force on trailer axle brakes

Used to reduce the force of the service brakes on the front steering axle

9 / 30

The air that exhausts from an air brake system can carry:

Dirt and dust

Moisture

Oil

All the above

10 / 30

What component prevents over-pressure in the air brake system?

Air compressor

Governor

Safety valve

Slack adjuster

11 / 30

What is the most common type of foundation brake system used in commercial vehicles?

"S" cam brake

Disc brake

Wedge brake

Hydraulic brake

12 / 30

What is the purpose of an air dryer in an air brake system?

Store compressed air

Increase air pressure

Reduce engine load

Remove moisture from the air

13 / 30

Wedge brake components include:

Brake drums and brake shoes

Camshafts and brake callipers

Rotors and brake drums

Callipers and rotors

14 / 30

What type of brake is used in both emergency and parking situations?

Service brake

Wedge brake

Spring brake

Disc brake

15 / 30

What should you do when the low air-pressure warning device activates?

Speed up to compensate

Stop the vehicle as soon as safely possible

Continue driving normally

Reduce your brake usage

16 / 30

How does an "S" cam brake apply the brakes?

By compressing a spring within a brake chamber

By rotating a wedge between brake shoes

By forcing brake shoes against the drum via an "S"-shaped camshaft

By clamping brake pads against a disc

17 / 30

A governor controls air compressor

Temperature and speed

Temperature

Cut-in and cut-out pressures

Speed and pressure

18 / 30

Air compressors:

Generate heat to stop a vehicle

Force air into a smaller space

All the above

Are filled with brake fluid

19 / 30

The normal operating pressure range for air brake system is:

0 to 1035 kPa (0 to 150 psi)

414 to 828 kPa (60 to 120psi)

552 to 932 kPa (80 to 135 psi)

828 to 932 kPa (120 to 135 psi)

20 / 30

Air compressors are powered directly by the engine or by using:

Chains and sprockets

Belts and pulleys

Belts and chains

Brackets and supports

21 / 30

At what pressure must the low air-pressure warning device activate?

Below 200 kPa (30 psi)

Exactly 500 kPa (75 psi)

Above 414 kPa (60 psi)

At or above 380 kPa (55 psi)

22 / 30

What is the normal operating pressure range for most air brake systems?

300-500 kPa

552-1000 kPa

800-1200 kPa

100-200 psi

23 / 30

The compressed air in an air brake system is stored in:

The brake chambers

The air compressor governor

The air lines and valves

The vehicle's air tanks

24 / 30

Air tanks must be drained regularly because:

This is where primary and secondary air collect

This is where moisture and oil collect

Tanks will develop too much pressure

Tanks will overheat

25 / 30

What happens if the pushrod stroke exceeds its adjustment limit?

Air pressure surge

Increased brake efficiency

Enhanced braking responsiveness

Reduced brake force

26 / 30

Which device adds alcohol vapor to prevent freezing in the air brake system?

Governor

Alcohol evaporator

Safety valve

Air dryer

27 / 30

Which type of foundation brake uses a disc-shaped rotor and caliper?

Disc brake

Drum brake

Spring brake

Wedge brake

28 / 30

What is the first tank that compressed air enters in an air brake system called?

Secondary tank

Dry tank

Primary tank

Supply or "wet" tank

29 / 30

Air compressors are mounted directly onto the engine or by using:

Brackets and fasteners

Belts and chains

Pulleys

Sprockets

30 / 30

Air compressor cut-in pressure must be less than:

828 kPa (120 psi)

525 kPa (80 psi)

414 kPa (60 psi)

932 kPa (135 psi)

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